Yet Another Hierarchically Organized Oracle
YAHOO is a hierarchical subject-organized catalog of documents on the
World Wide Web and the Internet. It is a very powerful public service
for locating information on the Web quickly and reliably.
URL for Front Page:
URL for Top-Level Page:
URL for Forms Search Page:
URL for FAQ Page:
URL for Help Page:
URLs for Authors' Pages
Most features are available to non-forms users, but searching requires a
browser with forms support.
The content has no particular focus, but spans numerous fields of
YAHOO is primarily set up as a subject catalogue with ample
cross-references pages. The root level of the hierarchy is divided
into 20 major headings, and each subject may contain subheadings
over 4 levels deep (more specific). Additional pages are added to
the hierarchy as necessary to ease navigation.
- YAHOO also provides basic search capabilities,
using custom database and management software.
- Multiple Keyword support
- Primitive Boolean and Proximity Searching
- Keys can specify complete words or substrings
- No True Boolean Support
- No Proximity Searching
- No Hyphenation or Punctuation Contral
- No Controlled Vocabulary established
- It offers an option to limit matching entries (100, 200, or
- The engine searches across document titles, URLs, and/or comments.
- Documents are gathered for inclusion by user submission as well as
automated searches across various "What's New" pages and related
newsgroups. Selected links are then evaluated by index administrators
and placed into the subject hierarchy as appropriate.
- Both the hierarchy of the subject index and the layout of the
search page are very simple.
- The entire system runs from a single DEC Alpha 3000/400 workstation.
- Navigation across the hierarchy is very fast, with a peppy
response time. Even the search engine responds in about
10 seconds, but may refuse a search when the load is high
(primarily during the day).
- Quality of Index
- The collection boasts 55,000 entries, and new links are being added
at the rate of 200-400 a day.
- There seem to be very few dead links on the server, probably because
the high traffic encourages user feedback.
- Despite the size of the collection, the organization of the entries
and the layout of the page make for easy navigation.
- Additional Services and Features:
- Both a Help and a
FAQ page help users
learn navigation and answer their questions.
- Each index page provides useful cues to help orientation and
- The YAHOO menubar provides constant access to useful pages,
up a level, the top-level, search form, add URL form, and
- The hierarchy indicator shows where you are located in the
subject tree (each step is separated by a colon, e.g.,
Its also a link to step up a level in the tree.
- Additional levels in the index are indicated by bold
entries, with a number indicating how many entries exist
on that page or below.
- The '@' mark indicates a cross-referenced entry leading to
another part of the hierarchy.
- The authors compile one of the Internet's best
What's New? lists
daily, organized by subject with a brief description of the new
service. To encourage netsurfing, there are also resources
that list What's
Popular on YAHOO? and
on the Web?.
- Users are encouraged to recommend pages for addition to the
catalog through the Add to
- Each list of documents provides a short sentence or paragraph that
describes the indicated link, as well as a tag indicating a new or
Demonstrate a sample search session explicitly listing:
- Keyword(s), Boolean search controls
- Documents delivered
- Output format
email@example.com - 6/12/95